583 results about "Grindstone" patented technology

To provide a high-rigidity flat grinding device, a substrate flat grinding device has three fastening plate lifting-and-lowering mechanisms that have kinematic couplings and a cylinder rod that move the fastening plate upward or downward. Being a high-rigidity grinding device in which the load of the fastening plate 6 also is a load on the grindstone 14 that does the grinding, there is little deflection in the thickness distribution of the substrates that are obtained, even if they are semiconductor substrates having a large substrate diameter of 450 mm.

Disclosed is an improvement in a grinding machine comprising at least a turn table, rotary chuck tables for holding work pieces to be machined, a first grinding means for grinding the work piece held on the chuck table and a second grinding means for grinding the first-ground work piece held on the chuck table. The first grinding means comprises at least a first grinding wheel having pieces of grindstone set so as to define together a first grinding plane, and a first spindle fixed to the first grinding wheel. Likewise, the second grinding means comprises a second grinding wheel having pieces of grindstone set so as to define together a second grinding plane and a second spindle fixed to the second grinding wheel. The first and second grinding means are so arranged that the first angle formed between the linear line connecting from the center of rotation of the turn table to the center of rotation of a selected chuck table and the linear line connecting from the center of rotation of the selected chuck table to the center of rotation of the first spindle is equal to the second angle formed between the linear line connecting from the center of rotation of the turn table to the center of rotation of the selected chuck table and the linear line connecting from the center of rotation of the selected chuck table to the center of rotation of the second spindle. This arrangement assures that all finished work pieces have on and same thickness.

This invention provides an apparatus for manufacturing a helical part by feeding a wire W toward a pointing tool 21 and pushing the wire W against the pointing tool 21 to forcibly wind the wire. The apparatus comprises: a feed roller 12 for feeding the wire W toward the pointing tool 21; a wire feeding motor 111 for rotatably driving the feed roller; a grindstone tool unit 30, which holds a discoid grindstone 31 rotatable and movable, for cutting the wire W by the rotating discoid-grindstone 31; and a CPU 100 for controlling the wire feeding motor 111 and grindstone tool unit 30 to move the discoid grindstone 31 on a plane which is substantially perpendicular to a coil growing direction of the helical part and to cut the wire W in a direction which is substantially perpendicular to the coil growing direction.

A grindstone tool forperformpredeterminedprocessing on a workpiece, wherein a radio IC tag from, and to, which information can be read, and written, without contact is embedded in the grindstone tool.

In the manufacture of a brush-shaped grindstone (3), embedding holes (310) are formed in a grinding element holding surface (311) of a holder (31) in mutually separated positions. A base end side of a plurality of wire-shaped grinding elements (32), formed such that a composite yarn composed of inorganic filaments is impregnated and hardened with a resin, is aligned, and rod assemblies (320) are thereafter formed by fixing the base end side of the plurality of wire-shaped grinding elements (32) with adhesive (71) in holes (60) of a die material (6), which is formed to have substantially the same size as the embedding holes (310) of the holder (31). The rod assemblies (320) are thereafter embedded in the embedding holes (310) of the holder (32), and fixed with adhesive (72). Whereby, removing burrs from a precision work component, performing polishing, and the like can be carried out with good efficiency and high precision.

A polyol composition contains a polyaminochlorophenylmethane mixture (A) and a polyol (B), in which the component (A) is uniformly dissolved in the component (A) in a weight ratio of 30/70 to 60/40. The component (A) includes 50 to 70% by weight of a specific binuclear polyaminochlorophenylmethane compound, 20 to 40% by weight of a specific trinuclear polyaminochlorophenylmethane compound and 5 to 10% by weight of a specific tetranuclear or higher polyaminochlorophenylmethane compound. The polyol composition exhibits excellent miscibility and dissolution stability, is liquid and enables molding of a foamed article for abrasive in a simple two-component mixing casting machine. According to the present invention, water serving as a foaming agent can be added to the polyol composition containing MBOCA, and the composition for a two-component curable abrasive foam can be held to a temperature equal to or lower than the boiling point of water, thus avoiding water from evaporating upon molding. The resulting abrasive foam has a uniform density distribution and exhibits excellent mechanical properties. A method for satisfactorily producing such an abrasive foam is also provided.

A compound chamfering device that manufactures prism-shaped ingot blocks of excellent surface smoothness is disclosed. The four-corner round surfaces and the four sides of a prism-shaped ingot obtained by using a pair of rotary blades of a slicer to perform four-side peeloff of a cylindrical ingot block are chamfered by rough grinding with a pair of cup wheel type rough grinding grindstones. A pair of cup wheel type finishing grinding grindstones are used to chamfering by finishing grinding the four-corner round surfaces and the four sides of the block.

The honing jig has a base on which a whetstone or other abrasive substance is mounted. A pair of spaced guide rods extends the length of the base. A carriage is mounted to tubes which slide along the rods and through which the guide rods extend. The blade to be sharpened is held to the carriage by a clamp and the clamp swivels on the carriage to allow the inclination of the blade relative to the whetstone to be adjusted. The angle of the guide rods can be adjusted to permit fine adjustment of the inclination of the blade.

Driving rollers 2, 3 which rotate in the same direction are arranged in parallel to each other. A plurality of convex portions 5a, 5b, 5c having different radii of curvature Rr1, Rr2 and Rr3 are formed along the axial direction at opposing positions on the driving rollers 2, 3. A rolling element 4 which is fed into the gap between the driving rollers 2, 3 and rotated is moved along tracks having different radii of curvature Rw1, Rw2 and Rw3 in the axial direction. There is provided a superfinishing grindstone 6 which is pressed on the rolling surface of the rolling element 4 moving on tracks having different radii of curvature to superfinish the rolling surface of the rolling element 4.

A multi-abrasive tool is constituted by a support on which abrasive elements are present. Such abrasive elements are arranged in a manner so as to form one or more paths along which the successive abrasive elements have grain size sequentially increasing or decreasing by an arbitrary quantity when passing from on element to the next. Such principle gives rise to abrasive tools with different conformation both for polishing machines and for grindstones. For roto-orbital and planetary polishing machines, and optionally orbital, such support is circular and the grain sequence is circumferential, or radial, or in both directions. A first tool is constituted by contiguous (or non-contiguous) circular rings, that are differently abrasive. A second tool comprises differently abrasive elements arranged along the circular peripheral edge. A third tool comprises differently abrasive elements arranged along a spiral path of 360° starting from the edge. A fourth tool comprises two 180° spiral paths with reversed roughness sequences. A fourth tool comprises pairs of differently abrasive small cylinders fixed to a plate on concentric circumferences. A fifth tool is obtained directly on the plate of the polishing machine by means of reliefs and spacers for fixing differently abrasive sectors. For linear polishing machines, the abrasive support is a belt along which differently abrasive rectangular or oblique zones follow each other. For alternative polishing machines, the abrasive support is a plate shaped like the aforesaid belt. For tools to use with grindstones, the multi-abrasive element has a cylindrical rotation symmetry, or conical with rounded tip, or spherical symmetry.

In order to eliminate a delay in a driving system and a control system during sequential operation of various component parts, to thereby realize a high speed and easy multi-axis control, a work delivery and removing device (7), a grindstone retracting device (14) and a gauge retracting device (19) are driven by respective compact electric motors (15, 13, 18) through associated reduction gear units. A reference pulse generator (34) for sequencers for generating reference pulses is provided, which reference pulses are distributed by a pulse distributor (35) to various position change curve setting units (36A, 36B, 36C). The position change curve setting units (36A, 36B, 36C) are a so-called electronic cam and output in response to receipt of the corresponding reference pulses respective position commands representative of predetermined position change curves (a, b, c). Servo-controllers (37A, 37B, 37C) are used for controlling the electric motors (15, 13, 18) in response to these outputs.

End face grinding apparatus (1) for glass substrate including grindstone (4) for grinding an end face of glass substrate (3) by making relative movement to the glass substrate (3) and including grinding fluid supply means (6) for feeding grinding fluid (7) to an area surrounding a grind location of the glass substrate (3), wherein there is disposed water spouting means (8) for forming water curtain (9) adapted to block the flow along the surface of the glass substrate (3) of any cut dust contained in the grinding fluid (7) scattered in the grinding of the end face of the glass substrate (3) by the grindstone (4).

To cut a protecting sheet adhered over the obverse of a wafer, an inclination angle of a cutting tool is adjusted according to a form of a chamfered part of the wafer and a finishing thickness of the wafer so that the protecting sheet is cut into the required minimum size for protecting the obverse of the wafer. Thus, the protecting sheet is not included inside a removed portion in a grinding process of the reverse of the wafer with a grindstone even if the wafer is ground to have extremely thin finishing thickness. Hence, the protecting sheet is not ground while the reverse of the wafer is ground, and the grindstone is thus prevented from being clogged up with ground material of the protecting sheet.

A brush-like grindstone (1) has threadlike grinding elements (2) each being a thread that is a collection of long inorganic fibers and is impregnated with resin and solidified. To grind work (W), the grindstone (1) is moved relative to the work (W) with the forward ends of the threadlike grinding elements (2) pressed against the work (W). In order to prevent the grinding elements (2) from breaking, each threadlike grinding element (2) is curved from its base end to its forward end with high hardness of the grinding elements (2) maintained. Also, the grinding elements (2) are formed in an elliptic or oblong cross-sectional shape whose minor axis is aligned with the direction of the curve. Therefore, the grinding elements (2) have extremely high rigidity in the direction perpendicular to the direction of the curve but they easily deform in the direction of the curve. Consequently, the grinding elements (2) softly engages the work (W) at their forward ends and, when excessive force acts on the elements (2), the brush-like grindstone (1) does not break because the elements (2) deform to absorb the force.

To provide a grindstone that even in the event of chamfer machining of an edge portion of plate glass, ensures prevention of any defect or breakage thereof without productivity decrease, and provide a method of machining an end face of plate glass. The grindstone (10) comprises aluminum disk-shaped base metal (10a) provided at its center with hole portion (10a', with 120 mm outside diameter, 80 mm inside diameter and 40 mm thickness); ringlike shock absorption layer (10b, with 10 mm thickness) of, for example, phenolic resin, bonded to the outer circumferential surface of the disk-shaped base metal (10a); and ringlike abrasive grain layer (10c, with 5 mm thickness) bonded to the outer circumferential surface of the shock absorption layer (10b).

The present invention discloses a surface-sized news-paper and its making method. It includes the following steps: using bleached sulfate needle wood pulp (BKP), beating, then mixing it with Italia poplar alkaline hydrogen peroxide hot-ground mechanical wood pulp (APMP) and bleached mechanical grindstone ground wood pulp (GP), according to mixing ratio blending them into mixed pulp, adding auxiliary material and making them into raw material pulp for making paper. The standard quantity of said news-paper is 45-49 g/sq.m, brightness (ISO) is 57-63%, opaqueness is greater than 91%, transverse tearing index is greater than 5.5mV, sq.m/g, surface strength is greater than 0.5 m/s, and breaking length longitudinal is greater than 4000 m.

A double-side grinding apparatus is designed to be capable of minimizing thermal expansion of hydrostatic pad members and reducing nanotopography in performing wafer grinding. The double-side grinding apparatus is a double-side grinding apparatus for wafers that can simultaneously grind either surface of a wafer to be ground by pressing a grindstone against either surface of the wafer to be ground while hydrostatically supporting either surface of the wafer to be ground in a noncontact manner. Each hydrostatic supporting unit is formed with a hydrostatic pad member facing the wafer to be ground, and a base member placed on the back surface of the hydrostatic pad member. The hydrostatic pad member is made of a ceramic member, and the base member is made of a metal member.